Index: src/macros.h
==================================================================
--- src/macros.h
+++ src/macros.h
@@ -141,10 +141,18 @@
 # define OF_RETURNS_RETAINED
 # define OF_RETURNS_NOT_RETAINED
 # define OF_RETURNS_INNER_POINTER
 # define OF_CONSUMED
 # define OF_WEAK_UNAVAILABLE
+/*
+ * undef them first, as it seems Clang has these as built-in defines for some
+ * platforms, even when ARC is disabled (at least it does when cross-compiling
+ * for Android).
+ */
+# undef __unsafe_unretained
+# undef __bridge
+# undef __autoreleasing
 # define __unsafe_unretained
 # define __bridge
 # define __autoreleasing
 #endif